A high pass filter will do nothing to an ingressed signal such
as 2 metres on cable channel 18 because they are on the same
frequency. I am of course assuming that you're talking about
your 144 MHz signal. If it's a harmonic, you need to put the
high pass filter on your ham coaxial cable obviously.
I would think Canada would have leakage requirements akin
to the FCC (20 microvolts/metre @ 3 metres OR no harmful
interference) because of possible problems with the aeronautical
band 108~138 MHz and cable television mid-band channels.
73,
Bob AA0CY
----------
From: Pete Smith[SMTP:n4zr@contesting.com]
Sent: Wednesday, December 22, 1999 6:12 AM
To: Gorsline Family; rfi@contesting.com
Subject: Re: [RFI] Phone RFI fixes - no ring, lower cost solutions?
At 08:47 PM 12/21/1999 -0500, Gorsline Family wrote:
>
>Background - roof mounted F12 C3S, 100 wts in downtown row house. Not
>on air much - casual DXer (310 DXCC). Neighbours have telephone RFI, so
>do I. TVI as well - mostly channel 3 and videotapes - everyone on cable
>with VCRs. Decided it was time to fix things up - neighbours tolerant
>and I get off air (even when in the pile for a new one) when asked.
>But, the countries are getting a bit harder and teenagers expect
>continuous telephone availability.
>
>I eliminated my telephone RFI by grounding all spare conductors and
>putting .001 caps from each side to ground at the entrance, plus and 10
>#43 beads on one phone cord. Problem is that the long distance ring
>(Morse D) wouldn't fire and wouldn't trigger voice mail - local single
>ring OK. Removed caps, ring now is OK and of course, RFI is back.
>Ideally, I'd like to give the neighbours the plug-in modular filters -
>enough for every phone (say 5/house). At $30-40 CDN each, is there a
>less expensive way?
K-Com also sells the filter components in a hard-wire form for
significantly less.
Don't know if you want do surgery on the neighbors' phones, though. They
might give you a significant price-break on a quantity of the modular units.
>
>For the TVI - is there a high pass coax filter (ideally male-female to
>put in the CATV line)? Yes, lots of cable ingress/egress - 2m and CATV
>channel 18, pagers on channel 17 and 21.
Authorities here are quite fierce on cable companies about leakage. Does
the Canadian counterpart have anything to say?
Frequently, local in-house leakage results from splitters with
un-terminated ports, poorly-installed connectors, etc. Why not try to
clean up your own house first, as a guinea pig. ICE makes a good high-pass
for coaxial systems, I'm told.
73, Pete N4ZR
Don't forget to update your entry in the contest station database
http://206.102.70.3/search.htm
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